COMPARISON BETWEEN CHINESE CODE AND AMERICAN CODE IN SHEAR-TORSION STRENGTH OF RC MEMBERS

Shear-torsion strength calculation methods and results of RC members using Chinese code (GB 50010-2002) are compared with those using American Code (ACI 318-08) in this paper. The reliability levels of the two codes are also analyzed. It is shown that the Trilinear Model used for shear-torsion behavior modeling in Chinese code expands the shear-torsion envelop, leading to an overestimation of concrete capacity and safety margin. While American Code provides a more conservative model and requires larger amount of steel reinforcement, hence is more conservative. Moreover, American Code can satisfy the strength demand of 1/4 Circular Arc Model test but Chinese code cannot. The reliability level of the Chinese Code can not meet the requirements of Unified Standard for Reliability Design of Building Structures (GB 50068-2001).